Many consider this extended live coverage a hallmark in television news.

Petroglyphs are one of the earliest expressions of abstract thinking and are considered a hallmark of humanity.

Outstanding graduate programs are the hallmark of a great university.

Anthropologists consider burying the dead an indicator of a spiritual belief system and a hallmark of modern humans.

Working long hours is considered a hallmark of a medical residency.

Benny was a unique and memorable individual whose hallmark was honor, truth and generosity of spirit.

Convenience is not a hallmark of these destinations.

The skinned knee is a hallmark of childhood summers.

It is the hallmark of a successful technology that it becomes almost invisible.

It is a spectacularly beautiful place and a hugely significant hallmark for ocean conservation.

British Dictionary definitions for hallmark

hallmark

/ˈhɔːlˌmɑːk/

noun

1.

(Brit) an official series of marks, instituted by statute in 1300, and subsequently modified, stamped by the Guild of Goldsmiths at one of its assay offices on gold, silver, or platinum (since 1975) articles to guarantee purity, date of manufacture, etc

2.

a mark or sign of authenticity or excellence

3.

an outstanding or distinguishing feature

verb

4.

(transitive) to stamp with or as if with a hallmark

Also (for senses 1, 4) platemark

Word Origin

C18: named after Goldsmiths' Hall in London, where items were graded and stamped

1721, official stamp of purity in gold and silver articles, from Goldsmiths' Hall in London, site of the assay office; see hall + mark (n.1). General sense of "mark of quality" first recorded 1864. As a verb from 1773.